Telephone system



H. P. CLAUSEN.

TELEPHONE SYSTEM.

APPLICATIOQ FILED NOV. 21. 1916.

I Patented Nov. 30,1920.

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by W

- telephone station.

UNITED STATES PATENT OFFICE.

HENRY P. CLAUSEN, OEMOUNT VERNON, YORK, AS'SIGNOR TO WESTERN ELEC- TRIO COMPANY, INCORPORATED, OF NEW YORK, N. Y., A CORPORATION OF NEW YORK.

Specification of Letters Patent.

TELEPHONE SYSTEM.

Application filed November 27, 1916. Serial No. 133,626.

To allwhom it may concern Be it known that I, HENRY P. GLAUSEN,

a citizen of the United States, residing at Mount Vernon, in the county of Westchester and State of New York, have invented certain new and useful Improvements in Telephone Systems,-of which the following is a full, clear, concise, and exact description.

This invention relates to telephone systems, and more particularly to such systems in which a line circuit is provided with both a main telephone station and an. extension The object of the present invention is the provision of improved signaling means for such, systems and of means for preventing listening in by a person at the extension telephone set. V

In accordance with this invention, a line circuit, having a main telephone station con nected therewith, the call bell of which is normally connected to the line circuit, is provided with an, extension telephonestation, the callbelland telephonic apparatus of which is normally disconnected from the line circuit. A'slow operatingrelay, controlled by ringing current in the line circuit, serves torconnect' the call bell of the extension station to the line circuit at the expiration of a predetermined period after the beginning of the operation of the call bell at the main station. The main station the following-description taken in connection with the drawings, in which there are shown two line-circuits A and B, terminating at a central oflice in jacks with each of which are associated theusual line relay, line lamp and cut-off relay. A cord circuit C employed for interconnecting the line circuits is also located at the central, office. Only so much of the cord circuit C is shown as is necessary for a of this invention.v

' To line circuit A is connected amain telephone station D having a call hell 5 bridged across-the line c ircuit.-. In parallel with the call bell 5 is a slow-release relay 6. which is responsive to alternating current from' a -normally closed contacts of the key 15.' call bell 17, located at the station E and.

proper understandingare connected respectively to the ring and tip sides of line circuit A.

Line circuit B is provided with a telephone station E having a call bell 16 bridged across the line circuit. At station E which,

:as will hereinafter more fully appear, serves as an extension station for line circuit A,

is located the-key 15, before referredto. The telephone apparatus and the call 'bell 16 at station E are connected to the tip and ring conductors of line circuit B through connected through normal contacts of key 15 to the contact springslO and 11 of the relay 8, isnormally disconnected from the l1ne circuit A but may be connected thereto upon the operation of relay 8.

To signal station D on line A, the

operator 1nsertsthe plug of cord circuit G into the jack of line A, whereupon relays 80 and 31 in the cord circuit operate to connect a source of ringing current 7 to line A. The

call bell 5 at station D and relay 6 thereupon operate. If the party at station D immediately responds to the operation of call bell 5, the closure of the switch hook contact causes the disconnection of ringing current from the line in the usual manner and provides such a low resistance shunt for relay 6 that this relay immediately releases. 'However, if the party at station D does not immediately respond, the operation of relay 6 completes an operating circuit'for the upper winding of slow-operating relay 8. If this operating circuit remains closed for a-predetermined length of time, contact springs 10 and 11 will be moved into engagement with contact springs 12 and 13, respectively,

thereby bridging the call bell 17 across the line circuit A. The call bell 17 will thereupon be operated. The lower winding of relay 8 is included in this bridge with call bell .17. The subscriber at station E, responding to the operation of call bell 17, actuates key 15 and removes the receiver from the switchhoo-kr The actuation of key 15 disconnects the station EWithits call bell 16 from the line circuit B and connects it to line circuit A, and transfers call bell 17 from line circuit A to line circuit B, so that should a call be'madeon line B While the telephone apparatus of station E is connected to liIlQ'CiI'-" cuit A, call bell 17 Will beoperated. Upon the actuation oi key 15- and: the removal of thereceiver from the switch hook, a path of low enough resistance-is established for causing: the operation oftrippmgrelay 32 rnztlle cordclrcult to dlsconmectrmging cur- ;rent from-the line in-the usual manner, and

stationE to; its switchhook, relay 8' releases,

disconnecting stationE fromline-A. Should the party at station D removethe receiver thereat from its switchhook-While relay 8 isin its operated condition, relay 8 will re lease immediately,.due tothe lO'W resistance shunt p'ath established? bythe' closure of the switchhook contactatstation 'D. It Willbe seen, there'tore, that station Eca'nno't be con nected to line circuitA While station D is connected thereto,

f What-is-claimedds 1;. A telephone system comprising, a line '-circuit, a source 0% signalingcurrent, means for connect ng-said-souree wlth the line cir cuit, a, call-belll associated with the line" circuit and responsive to current fronr said source-when connected with the line circuit, a normally inoperative call bell, means responsive When' said source is connectedwith the dine" circuit to; operatively connect the second call bell therewith", a telephonicapparatus associated with: said secondcall' bell, and means also associatedtherewith fOl'ZCl lS- connecting. the second call: bell from the line circuit and simultaneously connecting thereto the telephonic apparatus.

2.' :A telephonesystem comprisinga line I circ'ui-t,' a call bell-connected' with the line circuit-,5 a'so'ur'ce of ringing current,=;means for connecting 'saidi sourcewith the" use cir- ,cuit for operatimg the cal l bell, in secondc'a ll Joell,electromagnetic meains independent of the first: call bell controlled byrcurrent from said source for" connecting" the' sec'ond call bell: to:the line circuit and telephonic apparatus Whose connection with theline 'circuit iscontrolled by'the electromagnetic means.

7 Bali; telephone systemicomprising a line ;circ1rit,-t\vo callibel ls associated witlr the line circuit, a source of ringing current, means forconnecting the source With the line C11- cui t, for operating the call" bells, a relay bridged" acrosstheline circuit andlresponsive to current fromsaid source, aslow operating relay responsive to the operation of of one'ofthe call bells, and a switch adapted When-actuatedbeforethe full response of the slow operatingrelay to de'energize the bridged relay andithcreby preventsthe' oporationof "thecall bellnvhose operation is normally delayed; s

l. 1A"telephone'system comprising a line circuit,- a call bell connected with the line circuit,: a source o-fi ringing-current, means for connecting said source Withthe line cirfcuit for operating; the call bell a second call bell, it-Slow operating! YBLZI YTCODtZ Ol lGQl by current tnom said source for connecting the second call: bell toztheline,- and means asso ciatedith the first cal-l bell adapted when actuated to prevent the .operataoir-of "the slowopei' atingl rel'ay- 5. A'telephone systemzcomprising a'line circuit; call bell -.connected witlrzthe line circuit, a source otvringing' c'urrent; means for connecting said source Wltlliillfifillnfi circuit for" operatingtthe call bellea 'se'condi call bell, a. relay. bridged across thel line circuit and 1 responsireto zcurreiit fironI-said source,

a slowoperati ngxrela-y responsive to the-0peration odfthe bridged relay forconnecting the second-call" bell to the line c rcuit, telephonic apparatus Whose connection Wltll the line circuit"pri'orito theifiull response 'of the sloweperating relayrcausesthe deenergiza 'tion thereof, and otheri telephenl'c" apparatus whose connectionwvith the line'circi'iitnrainta-ins the: slow operating relayenergizeda,

6. 'As telephoneisyst'eni comprising a line circuit,- a main and: a nextension telephone. 7 statrongthereforga source ofi ringing current, I

means tor-"connecting said source to 5 the line circuit; a call bell for the-main station"con-' nectedl uwvith the line circuit responsive -'to current from said; source, normally disabled call be'll for? "the extension station, means controlled by-current*fr o1n said source for rendering the call bell of the extension station operative for signaling purposes," and a switching'fdevice at theme-in storing said means to "operative condition upon the subsequent disconnection" of the telephone apparatus from'th'e e circuit;

'F. 'Ai"telephonesystem comprising a line circuit, a mainand-an extension telephone stationathere'fo'r, source "of Tin ing current, means 'for connectingsaid source to the line circuit, a ca11 bell for the main station connected with 7 the line" circuit and responsive to current from said entree, a nori'na-lly' disthe bridged relay for delayingthe operation abled call bell for the extension station, and

means controlled by current from said source for rendering the call bell of the extension station operative for signaling purposes, and means at the main station for disabling the last mentioned means.

8. A telephone system comprising a line circuit, a main and an extension telephone station therefor, a source of ringing current,

relay responsive to the operation of the first mentioned relay for operatively connecting the second call bell with the line circuit, telephonic apparatus at the extension station, a switch thereat for connecting the telephonic apparatus with the line circuit and for disconnecting the second call bell, and a maintaining circuit for the slow operating relay established when the telephonic apparatus is connected with the line circuit.-

9. A telephone system comprising a line circuit, a main and an extension telephone station therefor, a second line circuit to which the extension telephone station is normallyconnected, a source of ringing current,means for connecting said source to the first line circuit, a call bell for the main station connected with the first line circuit and responsive to current from said source, a normally disabled call bell for the extension station, electromagnetic means controlled bycurrent from said source over the first line circuit for operatively connecting the second call bell with the first line circuit, telephonic apparatus at the extension station normally connected to the second line circuit, and a switch thereat adapted when operated to disconnect the second call bell from the first and to connect it with the second line circuit and to cooperate with the electromagnetic means to connect the telephonic apparatus with the first line circuit.

In witness whereof, I hereunto subscribe my name this 24th day of November A. D.,

HENRY P. CLAUSEN. 

